MIL-HDBK- 162A
Volume 1
15 December 1965
Section 3
DATE: 1 July 1964
ITEM NAME: RANGE-AZIMUTH INDICATOR
COGNIZANT SERVICE: USN
TYPE: AN/SPA-4, * -4A, ** -4B***
F5840-665-3686*
FEDERAL STOCK NUMBER:
F5840-644-4626**
F5840-552-1903***
USA
USN
USAF
USMC
Ltd Std*, **
STATUS OR TYPE CLASSIFICATION Sub .Std***
General Electric Company*; Radio Corporation of America **;
Mfg(s) Name or Code Number: Bendix Aviation Corporation***
FUNCTIONAL DESCRIPTION
Range-Azimuth Indicators AN/SPA-4, -4A, and -4B
provide PPI type presentations of target range and
azimuth when supplied with video and trigger signals
from any one of eight search radars. Azimuth is
determined by means of a mechanical cursor. The
target presentation is the result of two alternately
generated electronic sweeps -- the PPI sweep and the
cursor sweep. The PPI sweep is rotated through 360
degrees on the screen in synchronism with the
associated radar antenna, and the cursor sweep traces a
single, controlled radius. A spot-of-light range strobe
appears on the screen during the cursor sweep and can
be superimposed on any target in the PPI display, thus
permitting a highly accurate measurement of the target
range. Field changes to the AN/SPA-4 and AN/SPA-4A
provide an indication of true bearing which is
incorporated in the design of the AN/SPA-4B.
RELATION TO SIMILAR EQUIPMENT
None.
TECHNICAL DESCRIPTION
Video Input:
AN/SPA-4 - +1 to +2.5v
AN/SPA-4A, -4B - +2 0.5v
Trigger Input: +5 to +50v
Pulse Repetition Rate:
AN/SPA-4 - 140 to 3, 000 pps
AN/SPA-4A, -4B - 60 to 3, 000 pps
Operating Voltages and Power Requirements:
AN/SPA-4 - 115v 10%, 60 2 cps, 1-ph, 14.2
amp, 97% pf, 715 va, 690w
AN/SPA-4A, -4B - 115v 10%, 60 cps, 1-ph,
amp 10%, 90% pf, 1, 110 va
Type of Presentation: One 10-in. PPI
Range Marks:
AN/SPA-4 - 0.5, 1, 5, 20, and 50 mi
AN/SPA-4A, -4B- 0.5, 1, 2, 5, 10, 20, and
50 mi
AN/S PA-4: 1
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